VERSION.cmake: Bump to 2.0 beta2

VERSION.cmake

@@ -4,7 +4,7 @@ set( MIRALL_VERSION_PATCH 0 )
 set( MIRALL_SOVERSION 0 )
 
 if ( NOT DEFINED MIRALL_VERSION_SUFFIX )
-    set( MIRALL_VERSION_SUFFIX "beta1") #e.g. beta1, beta2, rc1
+    set( MIRALL_VERSION_SUFFIX "beta2") #e.g. beta1, beta2, rc1
 endif( NOT DEFINED MIRALL_VERSION_SUFFIX )
 
 if( NOT DEFINED MIRALL_VERSION_BUILD )